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[目的]研究钾、钙、钠交互作用对小白菜生长和钾、钙养分吸收效果的影响,为指导小白菜合理施肥提供科学依据。[方法]采用盆栽试验。试验分3组,分别为不同施钙(CaO)量处理、不同施钠(NaCl)量处理、不同施钾(K2O)量处理,另设对照组(CK)。钙处理设4个水平,CaO用量分别为0、0.17、0.33、0.67 g/盆;钠处理设4个水平,NaCl用量分别为0、1.50、3.00、6.00 g/盆,钾处理设4个水平,K2O用量分别为0、0.17、0.33、0.67 g/盆。氮(N)用量均为0.50 g/盆,磷(P2O5)用量均为0.17 g/盆。[结果]施用钾肥、钙钾配施均能提高小白菜对钾、钙的吸收,钙、钾之间存在交互作用。适量钙对小白菜吸收钾素产生促进作用,过量钙则产生抑制作用。钙、钾用量分别为0.33、0.67 g/盆时效果最佳,可以显著提高小白菜干物质积累量和钙、钾吸收量。[结论]在土壤钠水平较低时,施用一定量的钙能有效缓解钠对小白菜的胁迫作用。
[Objective] The research aimed to study the effects of the interaction of potassium, calcium and sodium on the growth of Chinese cabbage and the absorption of potassium and calcium nutrients and provide a scientific basis for rational cabbage fertilization. [Method] Pot experiment was used. The experiment was divided into three groups, which were treated with different amount of calcium (CaO), treated with different amount of sodium (NaCl), treated with different amount of potassium (K2O), and another group with CK. Calcium treatment set at 4 levels, CaO dosage were 0,0.17,0.33,0.67 g / pot; sodium treatment set at 4 levels, NaCl dosage were 0,1.50,3.00,6.00 g / pot, potassium treatment set at 4 levels , K2O dosage was 0,0.17,0.33,0.67 g / pot. The amount of nitrogen (N) was 0.50 g / pot, phosphorus (P2O5) dosage was 0.17 g / pot. [Result] The application of potassium fertilizer and calcium and potassium both increased the absorption of potassium and calcium in Chinese cabbage. There was interaction between calcium and potassium. Appropriate amount of calcium on the absorption of potassium in cabbage promote the role of excessive calcium is inhibited. Calcium, potassium were 0.33,0.67 g / pot best when the effect can significantly increase the accumulation of dry matter in cabbage and calcium and potassium absorption. [Conclusion] Applying a certain amount of calcium could effectively relieve sodium stress on Chinese cabbage when soil sodium level was low.